[clang] [compiler-rt] [llvm] [AArch64] Extend FMV support to more features (PR #229139)

[via cfe-commits]

================
@@ -59,8 +76,17 @@ int main(void) {
   if (__builtin_cpu_supports("avx2"))
     return 4;
 
+  if (__builtin_cpu_supports("sve2p1"))
----------------
Lukacma wrote:

I couldn't add the asserts as it would require the test to be dependent on LLVM objects, but I added the comment. I think the feature bit won't move once it is defined, so we don't have to worry about FEAT_SVE2P1 getting moved to another word once this patch lands.

https://github.com/llvm/llvm-project/pull/229139